package com.zhentao.filter;

import com.zhentao.utils.JwtService;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.Map;

/**
 * @ClassName: GatewayFilters
 * @Author: muhaoyang1
 * @Date: 2024/12/17 15:24
 * @Comment:
 */
@Component
public class GatewayFilters implements GlobalFilter {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1.获取request和response对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();

        System.out.println(request.getURI().getPath() + "过滤器-");
        //2.判断是否是登录
        if (request.getURI().getPath().contains("/login")) {
            //放行
            return chain.filter(exchange);
        }


        //3.获取token
        String token = request.getHeaders().getFirst("Authorization");

        System.out.println("token" + token);
        //4.判断token是否存在
        if (StringUtils.isBlank(token)) {
            System.out.println("没有token");
            response.setStatusCode(HttpStatus.UNAUTHORIZED);

            return response.setComplete();
        }

        //5.判断token是否有效
        try {
            int i = JwtService.verifyToken(token);
            if (i != 1) {
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }

            Map<String, Object> map = JwtService.getClaimsMap(token);
            Object userId = map.get("userId");
            //2.在header里面添加新的信息-userId
            ServerHttpRequest serverHttpRequest = request.mutate().headers(httpHeaders -> {
                httpHeaders.add("userId", userId + "");
            }).build();
            //3.重置header
            exchange.mutate().request(serverHttpRequest).build();

        } catch (Exception e) {
            e.printStackTrace();
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        //6.放行
        return chain.filter(exchange);

    }
}
